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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb0472470c25a6e766ac5d3229ddec85331ea79cf01ef9734e8ea072d7a78ee' 
  AND token = '4jIgnLDwnWX7G3ylgdx0fmOYpFNbw3vRHiNQ7TfDI8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}